An abnormal, solitary, benign growth of bone and cartilage, typically at the end of a long bone. Osteochondromas are usually discovered in persons 15 to 25 years of age. They are typically detected when the area is injured, or when they become large. It can be a hereditary condition, in which case it may be called hereditary multiple exostoses (HMS).
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A benign cartilaginous neoplasm that consists of a pedicle of normal bone (protruding from the cortex) covered with a rim of proliferating cartilage cells; may originate from any bone that is preformed in cartilage, but is most frequent near the ends of long bones, usually in patients 10–25 years of age; the lesion is frequently not noticed, unless it is traumatized or of large size; multiple osteochondromas are inherited and referred to as hereditary multiple exostoses. SYN: solitary osteocartilaginous exostosis. [osteo- + G. chondros, cartilage, + -oma, tumor]

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os·teo·chon·dro·ma -.kän-'drō-mə n, pl -mas also -ma·ta -mət-ə a benign tumor containing both bone and cartilage and usu. occurring near the end of a long bone

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n. (pl. osteochondromata)
a bone tumour composed of cartilage-forming cells. It appears as a painless mass, usually at the end of a long bone, and is most common between the ages of 10 and 25. As a small proportion of these tumours become malignant if untreated, they are excised.

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os·teo·chon·dro·ma (os″te-o-kon-droґmə) [osteo- + chondroma] a benign tumor consisting of projecting adult bone capped by cartilage projecting from the lateral contours of endochondral bones. Called also chondrosteoma, osteocartilaginous exostosis, and osteoenchondroma.

Medical dictionary. 2011.

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